What would you do about software license audit threat?

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

I'm in a difficult situation and trying to figure out my next steps.

software license audit threat. I've been dealing with this for about 6 months now and the situation isn't improving.

The contract was signed 9 months ago. I have a copy of the original agreement. The total amount in dispute is approximately $86,000.

Do I have a strong case? What should my next steps be?